Search for Dark Matter with ATLAS: Using Events with a Highly Energetic Jet and Missing Transverse Momentum in Proton-Proton Collisions at √s = 8 TeV
This thesis describes in detail a search for weakly interacting massive particles as possible dark matter candidates, making use of so-called mono-jet events. It includes a detailed description of the run-1 system, important operational challenges, and the upgrade for run-2. The nature of dark matter, which accounts for roughly 25% of the energy-matter content of the universe, is one of the biggest open questions in fundamental science. The analysis is based on the full set of proton-proton collisions collected by the ATLAS experiment at the Large Hadron Collider at √s = 8 TeV. Special attention is given to the experimental challenges and analysis techniques, as well as the overall scientific context beyond particle physics. The results complement those of non-collider experiments and yield some of the strongest exclusion bounds on parameters of dark matter models by the end of the Large Hadron Collider run-1.
Details of the upgrade of the ATLAS Central Trigger for run-2 are also included.
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10 Analysis Strategy
11 Data and Simulated Samples
12 Physics Objects Definitions
13 Event Selection
14 Background Estimation
15 Results and Interpretation
16 Prospects with Future LHC Data
Part V Conclusion
7 The ATLAS Experiment
Part III Operation and Upgrade of the Central Trigger
8 Operation of the Central Trigger During RunI
9 Upgrade of the Central Trigger
Part IV Analysis
Appendix ASignal Simulation Samples
Appendix BSignal Tables
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150 GeV miss 8TeV analysis ArXiv ATLAS Collaboration ATLAS detector ATLAS experiment background BCID beam boson pT bunch group calorimeter Central Trigger CERN control region corresponding cross section cut GeV dark matter data taking decay direct detection distribution effective field theory electron EmissT EmissT cut estimate fermions gluons hadronic hep-ex hep-ph histograms inputs interaction jet multiplicity jet pT JHEP leading jet lepton limits luminosity mediator masses missing transverse energy module mono-jet muon neutrino normalisation observed operators pair production parameters particles photon Phys Rev Lett physics quarks ratio reconstruction samples Search for Dark Sect signal region spin-dependent SR1 SR2 SR3 SR2 SR3 SR4 SR3 SR4 SR5 SR4 SR5 SR6 SR5 SR6 SR7 SR6 SR7 SR8 Standard Model statistical uncertainties syst systematic uncertainties Table threshold top and diboson transfer factor veto WIMP mass